Downhole Casing Scraper Induced Rotation Mechanism

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Solution Overview

Problem

In the oil and gas industry, multiple trips are often required to isolate a wellbore zone, perform operations, and clean the casing, which is inefficient and time-consuming.

Innovation Solution

A downhole tool with a casing scraper that includes an inner mandrel and a scraper mandrel with a lug moveable within a groove, causing the scraper blade to rotate and clean debris from the casing inner surface as the tool moves, reducing the need for multiple trips by effectively clearing debris in a single operation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If multiple trips are used to isolate wellbore zone, perform operations, and clean casing, then each operation can be performed effectively, but the number of trips increases and time is consumed

Engineering Contradiction:

Improveeffectiveness of wellbore operationVSAvoidtime consumed by multiple trips

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent combines the isolation tool and casing scraper into a single integrated downhole tool. The isolation tool includes both the isolation mechanism and the casing scraper with rotating scraper blades, allowing cleaning and isolation operations to be performed in a single trip, thereby reducing the number of trips and time consumed while maintaining operational effectiveness

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The casing scraper performs preliminary cleaning of the casing inner surface before the isolation tool is set. The rotating scraper blades remove debris and mud cake from the casing, ensuring a clean surface for effective sealing, which prepares the wellbore in advance for the isolation operation

Inventive Principle:

Principle #10Preliminary action

2Reliability

If multiple trips are used to clean casing before isolation tool is set, then effective seal is achieved, but the number of trips increases

Engineering Contradiction:

Improveeffectiveness of sealVSAvoidnumber of trips required

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The cleaning and isolation functions are merged into one tool. The casing scraper with rotating blades cleans the casing inner surface while the isolation mechanism is simultaneously positioned, allowing both cleaning and isolation to be achieved in a single trip, thereby increasing productivity while maintaining seal effectiveness

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The scraper blades continuously rotate and clean the casing inner surface as the tool moves through the wellbore, providing continuous cleaning action throughout the single trip operation, ensuring effective seal preparation without requiring multiple separate cleaning trips

Inventive Principle:

Principle #20Continuity of useful action

3Device complexity

If static scraper blade is used, then结构简单 is maintained, but debris is not effectively removed from casing inner surface

Engineering Contradiction:

Improvestructure of scraper bladeVSAvoiddebris removal effectiveness

Core Design Contradiction:

Device complexityVSProductivity

Solution Approach 1:

The scraper blade is designed to rotate dynamically as the tool moves through the wellbore. The rotation is induced by the interaction between the scraper blade and the casing inner surface, creating continuous rotational motion that enhances debris removal effectiveness while maintaining relatively simple overall structure

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The scraper blade generates its own rotation through the friction and interaction with the casing inner surface and debris. The system uses the existing downhole conditions and tool movement to induce rotation without requiring external power sources or complex drive mechanisms, thereby maintaining simplicity while improving productivity

Inventive Principle:

Principle #25Self-service

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The tool efficiently cleans the inner surface of the casing, reducing the number of trips needed for wellbore operations by ensuring an effective seal and facilitating subsequent operations with improved zonal isolation.

Implementation Method 1

friction from engagement of the scraper blade with the casing restrains movement of the scraper mandrel relative to the inner mandrel

Methodology Applied

Scientific EffectFriction: Friction

Data Source

PatentUS20230049390A1Downhole Tool with Casing Scraper with Induced Rotation

Publication Date: 2023.02.16 HALLIBURTON ENERGY SERVICES INC

AI summary

A downhole tool for cleaning debris from an inner surface of a downhole casing that includes an inner mandrel moveable within the casing; and a scraper mandrel movably coupled to the outside of the inner mandrel by the engagement of a lug within a groove, the scraper mandrel including a scraper blade positioned on an outside of the scraper mandrel. Longitudinal movement of the scraper mandrel relative to the inner mandrel causes the lug to move within the groove, causing the scraper mandrel and the scraper blade to rotate relative to the inner mandrel and clean debris from the inner surface of the casing. The longitudinal movement is achieved by restraining movement of the scraper mandrel relative to the inner mandrel by contacting the debris with a scraper blade on the outside of the scraper mandrel, causing the scraper mandrel to move longitudinally relative to the inner mandrel.